Fuel Stratification Effects on Gasoline Compression Ignition with a Regular-Grade Gasoline on a Single-Cylinder Medium-Duty Diesel Engine at Low Load

Journal Article · Tue Sep 21 04:00:00 EDT 2021 · SAE Technical Paper Series

DOI:https://doi.org/10.4271/2021-01-1173· OSTI ID:1822034

Curran, Scott ^[1]; Szybist, James ^[1]; Kaul, Brian ^[1]; Easter, Jordan ^[1]; Sluder, Scott ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Prior research studies have investigated a wide variety of gasoline compression ignition (GCI) injection strategies and the resulting fuel stratification levels to maintain control over the combustion phasing, duration, and heat release rate. Previous GCI research at the US Department of Energy’s Oak Ridge National Laboratory has shown that for a combustion mode with a low degree of fuel stratification, called “partial fuel stratification” (PFS), gasoline range fuels with anti-knock index values in the range of regular-grade gasoline (~87 anti-knock index or higher) provides very little controllability over the timing of combustion without significant boost pressures. On the contrary, heavy fuel stratification (HFS) provides control over combustion phasing but has challenges achieving low temperature combustion operation, which has the benefits of low NOX and soot emissions, because of the air handling burdens associated with the required high exhaust gas recirculation rates. Furthermore, this work investigates HFS and PFS combustion, efficiency, and emissions performance on a single-cylinder, medium-duty engine with a regular-grade gasoline (91 research octane number) at 1,200 rpm, 4.3 bar, and 3.0 nominal gross indicated mean effective pressure operating points with boost levels similar to those in a medium-duty diesel application. Authority of combustion phasing with main injection timing sweeps for HFS and second injection timing sweeps and fuel split sweeps for PFS are shown. In addition, this work is discussed in the context of previous findings with a light-duty diesel platform, and next steps and future direction for this work are presented.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1822034
• Alternate ID(s): OSTI ID: 1876278
• Journal Information: SAE Technical Paper Series, Journal Name: SAE Technical Paper Series Journal Issue: 01 Vol. 2021; ISSN 0148-7191
• Publisher: SAE International
• Country of Publication: United States
• Language: English

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